“The combination of low interest rates and strong consumer confidence based on solid job growth, cheap oil and low inflation continue to support further increases in home prices,” David Blitzer, chairman of the S&P index committee, said in a statement.

According to Nationwide’s Index of Healthy Housing Markets, the U.S. housing market is the healthiest it’s been in 15-years, the Columbus Dispatch reports.

“That doesn’t mean the fastest growing but the most sustainable. The odds of a housing downturn are very small,” David Berson, Nationwide’s chief economist, said in the article.

For starters, U.S. home prices are steadily rising to pre-crisis conditions and are back at 2005 levels. Supporting the rising prices, the U.S. housing market may be moving closer to a shortage as the number of available homes for sale dips to its lowest in over a decade.